Boring instrument.



Patented Feb.l3, I900.

J. TYNAN. BORING INSTRUMENT.

(Applicatian filed May 18, 1899.)

3 Sheets-Sheet 1,

(No Model.)

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No. 643,260. Patented Feb. [3, I900;

J. J. TYNAN.

BORING INSTRUMENT.

(Application filed May 18, 1899.) (No Model.) 3 Sheets ShHi 2.

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Patented Feb. l3, I900.

J. J. TYNAN. BORING INSTRUMENT.

, (Application filed May 18, 1899.)

(No Model.)

WITNESSES: M

INVENTORI trap TATES rricn,

PATENT JOSEPH J. TYNAN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO EDWVIN S. ORAMP, OF SAME PLACE.

BORING INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 643,260, dated February 13, 1900.

Application filed May 18,1899. serial No. 717,328. No model.)

To ctZZ whom it may concern:

Be it known that I, JOSEPH J. TYNAN, a citizen of the United Srates, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented'certain new and useful Improvements in Boring Instruments, of which the following is a specification.

My invention relates especially although not restrictively to boring apparatus of the character employed in forming circular apertures such as bolt holes in wooden and metallic structures, although its usefulness is not restricted to such work.

In the construction of ships and buildings, and particularly in the joining of sheathing plates, beams, girders, and braces, of vessels, it is very often necessary to form circular apertures or recesses in locations difficult of access and so far behind or beneath other portions of the structure, that ordinary power driven boring instrument-s cannot be supported or employed.

Heretofore where holes have been desired in locations of the character indicated, it has, therefore, been necessary in some cases to employ manually operated boring tools with the result of great expenditure of time and labor 7 in carrying on said work, and in some cases head and its controlling and operating gear in a carrying frame of such compact form and dimensions as to enable the entire structure to be placed in small and irregularly formed compartments or corners for the formation of the holes in the parts adjacent thereto,to provide anchoring devices adapted to secure the frame and the parts carried by it in operative position, and finally, to provide alternative driving gears by the employment of one or the other of which power from an external motor may be applied to the driving of perpendicularly with respect to the axis of the driving shaft of the motor.

In the accompanying drawings I show, and

herein I describe, a good form of a convenient embodiment of my invention, the particular subject-matter claimed as novel being hereinafter definitely specified.

In the accompanying drawings,

Figure 1 is a view in side elevation of an apparatus embodying the preferred form of my invention.

Figure-2 is a vertical sectional elevation of the same, on the line 2-2 in Figure 4:.

Figure 3 is a transverse sectional elevation on the dotted line of Figure 2.

Figure 4c is a top plan view of the apparatus shown in Figure 1.

Figure 5 is a View in side elevation, and Figure 6 a view in end elevation of the cutter head removed from its shank.

Similar letters of reference indicate corre sponding parts.

In the accompanying drawings,

A is the tubular body of the cutter head, the bore of which is suitably tapped to adapt it to be seated upon the" threaded free extremity of the cutter shaft B.

a a are cutter blades, two of which are employed in the apparatus shown, the hafts of which are seated in suitable recesses respectively formed in the opposing outer faces of the cutter head, and the cutting ends of which project in approximate parallelism any desired distance beyond said head.

The recesses in which the hafts of the cutter blades are seated are of greater breadth than said hafts, to afford space at one side of each for a holding block at having a projecting lip a which overhangs the haft,and which blocks are secured to the body of the cutter head by screws which pass through them.

The combined breadth of the holding block and haft mounted in arecess, is conveniently such as to extend across and fill it, that edge of the recess not occupied by the holding block being conveniently provided with an overhanging lip a oppositely corresponding to the lip a with the result that when the holding block is secured in position as described, said lips look said haft very securely against lateral displacement.

a are a pair of counter-sunk tapped openings formed in the body of the cutter head and opening through the rear end thereof, and each preferably opening laterally for a portion ofv its length into one of the blade recesses.

a are a pairof screws mounted in said openings and adapted to be rotated and thereby verticallyadjusted in said openings, the counter-sinks of said openings being of such depth as to allow the heads of the screws to be carried a considerable distance below the rear surface of the head.

The heads of the screws a project through the lateral openings by virtue of which the tapped openings are in communication with the cutter blade recesses, and engage behind suitable shoulders formed on the inner faces of the hafts, with the result that as said screws are rotated to the right and consequently caused to travel inwardly along the openings or, they will thereby occasion the corresponding advance of the cutter blades, and securely retain said blades in any advanced position to which they may be carried.

The carrying frame D of the apparatus is conveniently a metal frame having two wings or lateral extensions designated respectively E and F, and it is provided with a central circular cutter shaft recess d extending through it from end to end, and with a wheel recess or slot d of suitable dimensions perpendicular with respect to the recess (1. A

The shaft on which the cutter head is mounted, herein termed the cutter-shaft, extends through the said cutter shaft recess, and is within said recess convenientlyprovided with a sleeve G keyed to it by the key 9, and from which projects a circumferential flange g to which and the sleeve is rigidlysecured a gear- Wheel H mounted for revolution in the wheel recess.

The revolution of the wheel II will of course occasion the revolution of the cutter shaft.

The rear end of the cutter shaft, which normally projects beyond the frame, is inclosed within a cage or shell J which supports the devices for advancing the rotating cutter shaft and head.

The mechanism illustrated in the drawings for advancing the cutter shaft is as follows:

The cage J, which is, as to its inner end, secured for support to the body of the frame, is threaded as to its exterior face, and formed with a series, three being shown, of parallel longitudinally extending slots j cut through its wall from a point in the vicinity of its outer to a point in the vicinity of its inner end.

A follower K, secured by a swivel connection to the rear end of the cutter shaft, is shown as provided with a series of arms corresponding in number to the slots and projecting through the same.

M is a hand wheel, mounted in threaded engagement upon the exterior of the shell J,

and provided as to the bore of its hub with an annular channel or recess m into which the arms 70 project.

The swivel connection between the follower K and the cutter shaft B is conveniently formed by a set screw passing through an unthreaded opening in said follower and into a threaded opening in said shaft.

The follower and the rear end of the cutter shaft bear against each other, if preferred, to enhance the smooth and easy working of the device, through an interposed washer L and a series of balls L mounted in a suitable ball race formed conveniently in the inner face of the follower.

The wing E of the main frame embodies a brace or holder bar recess in which is mounted and secured a brace bar.

The brace or holder bar may be secured in any desired manner. I prefer to form the brace bar recess, as shown in the drawings, between two leaves E E into which the wing E is divided, and to form said leaves with projecting lips which, when the bar is in place, are expanded, so to speak, by said bar, out of contact. By providing said lips with bolts or equivalent contrivances, 6, they may be drawn toward each other, and caused to very firmly clasp the holder bar.

The brace or holder bar is preferably formed of two sections N N telescopically related, the one conveniently mounted in threaded relationship within the bore of the other, one of said sections N, as to its outer end conveniently tapering to a point, and the other N, being provided with a foot 'n equipped with a number of set screws mounted in threaded apertures in it, and which may be independently adjusted to the surface against which said foot is presented, said screws constituting what is known as a micrometer adjustment.

P is a spindle mounted in a suitable bearing formed in the wing F of the casing, and provided with a gear wheel P keyed to or otherwise secured upon it said wheel being disposed within a suitable wheel recess or slot in said wing.

Q is a suitably mounted idler which serves to transmit motion from the wheel P to the wheel H.

Manifestly upon rotation being imparted to the outer end of the spindle P, its motion will be communicated through the wheel P, the idler Q, and the wheel H, to the cutter shaft and effect the rotation of the latter and the cutter head.

Mounted upon the projecting shank of the spindle P is a bevel frame S, indicated in dotted lines, and serving to support a spindle R, upon which is mounted a bevel wheel R in mesh with the bevel wheel R which is in turn keyed to the spindle P.

Manifestly, rotation imparted to the spindle R, will equally with rotation imparted to the spindle P, occasion the rotation of the cutter shaft, and the motor which operates the apparatus may be connected to either of said spindles at will according to the position the frame may at various times occupy with relation to the motor, the object being, of course, to enable a communication to be made between the motor and my improved device regardless of the varying positions which the latter may occupy.

Then the work to be accomplished by the machine is of such a character that the motor willfor a considerable period of time make direct connection with the spindle P, instead of the spindle R,- the spindle P, carrying the bevel frame as shown, may be withdrawn from the structure, and a substantially duplicate spindle P, not provided with the bevel frame and associated parts, be substituted for it.

For this reason, the bevel frame and wheels are indicated in dotted lines.

The operation of my improved apparatus will be readily understood.

The rotation imparted through the wheels described will occasion the continuous rotathe shell J, and, owing to the engagement of the projecting arms of the follower K within the annular recess m of said wheel M said follower is carried inwardly along the shell by said wheel, said follower being of course capable only of a longitudinal movement as it is held against rotative movement by the projection of its arms through the slots in the shell.

The advance of the follower of course occasions the advance of the cutter shaft and cutter head.

The cutter head itself, is, as explained,provided with independent blades which are independently adjustable. Therefore one of said blades may project slightly more than the other, or they may be made of slightly different dimensions, enabling the work of boring to be equally distributed between the two as opposed to constructions in which the second blade merely follows idly in the path of the first, which does the work.

The brace or holder bar enables the frame to be very securely maintained in any position desired. The said bar is brought to approximately the right position to enable its respective extremities to make contact with suitable bearing surfaces,and is securely clamped in such position, the smaller section is then unscrewed until its advance end makes contact with one of the bearing surfaces.

a small tapped opening may be first made on the surface of the body at the point where the opening is to be formed, and a mandrel 0, having a threaded end, fitted in said recess.

When the mandrel has been thus fitted in position, its projecting end is received within the bore of the cutter shaft and serves as a guide for the cutter head in the subsequent operation of boring.

In forming a hole in this way the block of material bounded by the circular path cut by the cutter blades may be subsequently cut away or removed in any desired manner.

Instead however of employing the mandrel, an ordinary twist drill O may, as'shown, in Figure 1, be mounted in the bore of the cutter sh'ank in such position as to project beyond the advance ends of the cutter blades.

My improved cutting tool, which is of use in various applications, is advantageous in cutting circular holes through plates of metal such as armor plate of several inches thickness.

In this operation several such plates may, if desired, be piled one upon another and the cutter, provided with a twist drill as shown in Figure 1, brought into action upon them.

The twist drill first penetrates the metal and after it has reached a certain depth the cutter blades begin to act upon the upper plate.

As the operation proceeds the twist drill, penetrating deeper than the cutter blades, serves as a guide for the cutter blades.

As soon as the cutter blades cut through the substance of the first plate the implement is withdrawn, the circular section cut from the upper plate is removed, and the cutter is restored to its position with its twist drill in an opening already formed by it in the second plate, and the advance ends of the cutter blades in position to act upon the second plate of the series.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In a boring apparatus for cutting a circular hole or recess in a solid body, a cutter head mounted on a shaft and formed with a series of recesses in parallelism with its axis, each of which recesses has an inwardly extending or overhanging lip, parallel tapped openings formed in said head and opening through the end of the same, and also opening laterally into said recesses, screws mounted in said tapped openings, cutter blades IIO mounted in said recesses and controlled by said screws, and holding blocks mounted in said recesses and extending in parallelism with the cutter-blades and provided each as to its inner edge with an overhanging lip which overlies the adjacent edge of a cutter blade to secure it in position, the outer edges of the several cutter blades extending beneath the overhanging lips of the recesses, substantially as set forth.

2. In a boring tool, in combination, a main frame, a cutter shaft provided with a cutter head, means for occasioning the rotation of the cutter shaft, a fixed externally threaded cage or shell connected with or forming part of the main frame and inclosing the outer portion of the cutter shaft, a manually rotated device mounted upon and in threaded engagement with said cage or shell and adapted to be advanced along the same, and a connection between said manually rotated device and the cutter shaft through which the advance movement of the manually rotated device is communicated to the cutter shaft, substantially as set forth.

3. In a boring too], in combination, amain frame, a cutter shaft provided with acutter head, means for occasioning the rotation of the cutter shaft, a fixed externally threaded cage or shell connected with or forming part of the main frame and inclosing the outer portion of the cutter shaft, a manually rotated device mounted upon and in threaded engagement with said cage or shell and adapted to be advanced along the same, a swivel connection between said manually rotated device and the cutter shaft through which the advance movement of the manually rotated device is communicated to the cutter shaft, and balls disposed between the rotating and non-rotating parts of said swivel connection, substantially as set forth.

4. A main frame, a cutter shaft mounted in said frame, means for occasioning the rotation of said shaft, a threaded cage, embodying a longitudinal slot, secured to said main frame and inclosing the rear end of said shaft, a follower on the end of the shaft and having an arm projecting through the slot of the cage, a hand wheel in threaded engagement with the cage and embodying a channel or recess in which the arm of the follower is entered, substantially as set forth.

5. A main frame, a cutter shaft mounted in said frame, means for occasioning the rotation of said shaft, a threaded cage, embodying longitudinal slots, secured to said main frame and inclosing the rear end of said shaft, a follower mounted on the end of the shaft and swiveled to the same and having arms which project through the slots of the cage, a hand wheel in threaded engagement with the cage, and embodying a channel or recess in which the arms of the follower are entered, substantially as set forth.

6. A main frame, a cutter shaft mounted on said frame, means for occasioning the rotation of said shaft, athreaded cage, embodying longitudinal slots, secured to said main frame and inclosing the rear end of said shaft, a follower mounted in the end of the shaft, and connected thereto by a screw or pivot passing centrally through the follower and into the end of the shaft, balls disposed between the follower and shaft end, arms connected to the follower which project through the slots of the cage, and a hand wheel in threaded engagement with the cage and embodying a channel or recess in which the arms of the follower are entered, substantially as set forth.

7. A cutter head for cutting a circular hole or recess in a solid body, formed with a lateral recess in parallelism with its axis, a cutter blade of breadth inferior to that of the recess, mounted in said recess, a holding block mounted in said recess in parallelism with the blade and overlying the lateral edge of said blade, means for securing said block in said recess, and a screw mounted in a tapped opening in said head and adapted to bear against the end portion of the cutter blade to adjust the set of the latter, substantially as set forth.

In testimony that I claim the foregoing as my invention I have hereunto signed my name this 6th day of May, A. D. 1899.

JOSEPH J. TYNAN.

In presence of- F. NORMAN DIXON, Tnos. K. LANCASTER. 

